# D'Alembert pyramid system

D'Alembert betting system, also known as the "Pyramid system", was introduced in mid 1700s by a French mathematician Jean D'Alembert. It has become in fact one of the most famous and popular roulette betting systems.

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D'Alembert system largely relies on the idea that every player's loss is followed by a win, and, vice-versa, every win is followed by a loss. This idea is known as "Gambler's fallacy" and assumes that every individual spin of the roulette wheel has its own history that connects it to previous spins. In fact, every given spin of the wheel is an independent and unique event that has no history as it is always random. This idea makes the use of the D'Alembert system, just like most other betting systems, quite useless.

The roulette casino game with D'Alembert system applied proceeds as follows:

1. The player makes an outside bet of any size. The system actually works only with outside even-money bets like Black/red, Odd/Even or Low 18/High 18. Make sure that you bet on the same item during the whole game. It is also recommended to make medium size bets in the first place, so that the player is able to reduce the bet for several times before nothing is left. For example, if you bet \$20 and then deduce \$1 each time you win, you will be able to reduce bets 19 times before your original bet amount is over.
2. According to the "Gambler's fallacy", if your bet wins it must be followed by a loss, so the size of your next bet should be smaller so that you lose less. So you must subtract 1 unit from your bet each time you win.
3. If your bet loses, it is supposed to be followed by a win, so increase the size of it by one more unit.

For example, with the first \$10 bet won, you deduce \$1. Your next bet will thus make \$9. If this bet loses, add \$1 to it and make a \$10 bet again. With another loss add one more dollar and make an \$11 bet. If it wins, you will get a total profit of \$10.